zone valves

rick_31

boiler set up with four zones three for heat and one for dosmestic hot water ,customer says when one of the thermastats were switched on it would turn on boiler ,downstairs turns unit on . two located upstairs dont turn boiler on . I am going on the job on thursday ,should these zone valves turn on boiler or do two stats have to be calling for heat .These are honewell valves.

Timco

Any t stat should turn the boiler on. Maybe a lose common wirenut?

hr

Every zone valve should

have a thermostat driving it. Generally the ZV has an end switch to call on the circulator and boiler. That is the purpose of having multiple zone valves, any or all ZV can call on the system. Including the indirect ZV.

Sounds like some wiring troubleshooting

hot rod

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Weezbo

I think it depends...

i have stand alone systems with variable speed injection off a buffer tank that communicate hydronically to the set point and the two series injection loop zones to the buffer off the boiler.*~/:) i hope that wasnt as clear as mud.

if there is a means of controling the boiler it would be to insure that it fires when called by a T stat of some sort zone valves that open an close dont necessarily require the boiler to start is what i am saying... when some sensor or switch tells it to go Then it goes.

i have other systems that make and break independently of the boiler ,however when the temp changes That makes a switch and it fires.

in your case it should have some t stat that calls,and or opens all the other zone valves ...either seperate t stats or all zones call at once . unless like i say it is a stand alone system that has some sensor or switch that sends the message to the boiler to send heat that direction..to me it sounds like some one tied the wires from the zone valves together in such a way as to not allow communication with the boiler and t stats....

Dale

depends also

I think weezbo is correct although I don't understand all he said. To me since you have domestic hot water the boiler may be already maintaining temp and someone may have just put a zone in that just starts the pump when the zone valve opens. If the boiler is definately a cold start with no temp maintained then the zone valve that doesn't "start" the boiler needs to and as HR said needs to have all the switch wire nuts common to the burner circuit.